<http://schema.org/caption>
"Peek is a smartphone-based eye-testing kit being developed in the UK (Photo: &lt;a href=\"http://www.peekvision.org/\" target=\"_blank\"&gt;Peek&lt;/a&gt;)"^^<http://www.w3.org/2001/XMLSchema#string>
<http://newatlas.com/peek-eye-testing-smartphone/28764/>